ROSEMOUNT 5600
CHEMICAL
Chemical Company Reduces Maintenance Costs in
High Temperature and Pressure Application
RESULTS
• Reliable replacement of nuclear gauge
• Robust signal despite process conditions
• Minimized condensation and deposits in the antenna
• Reduced maintenance costs
APPLICATION
PTA Crystallizer, 3rd stage
Application Characteristics: Pressure of 289 psi (20 bar) and temperature
of 450 °F (232 °c) agitation, occasional foam. Purified Terephthalic Acid
Slurry. Product tends to solidify at cooler temperatures and form deposits
over time.
CUSTOMER
BP Chemical, Cooper River, SC
CHALLENGE
BP Chemical's Cooper River site had been using nuclear level gauges to
measure their higher temperature and pressure PTA crystallizers. The
combination of the higher pressure and temperature along with agitation
and the continual precipitation of solids eliminated the use of most other
level technologies.
The style of nuclear gauges on these vessels included a detector that was
inside the vessel. While it could handle the heat and pressure and most
process changes, it would gradually become coated. The coating
eventually built up enough to cause erroneous level readings.
The Rosemount 5600 is on a nozzle that allows easy
accessibility at floor level. The flange and nozzle of
the 5600 are insulated to prevent condensation on
the antenna in this potentially cooler area.
SOLUTION
BP Chemical installed the Rosemount 5600 Radar Level transmitter with a
special quartz process seal that could handle the pressure and temperature
conditions. In addition, the Rosemount 5600 had the capability of filtering
out signal noise resulting from agitators, baffles, and other internal
objects.
The installation nozzle was midway between the agitator and the wall.
From this position, the radar beam could detect the smallest disturbances.
The installation nozzle was a 6 inch nozzle that was 19 inches (0.5 m) tall,
allowing the head of any device to be easily accessible from the floor above
the tank. Because of the longer nozzle, an extended cone antenna was
For more information:
www.rosemount.com
© 2006 Rosemount Inc. All rights reserved
The 19-in. (0.5 m) insulated mounting nozzle
allows the head of the gauge to be above the floor
level.
CHEMICAL
used to ensure that any disturbances from the nozzle were eliminated by
the antenna walls.
Initially, with this longer nozzle, some condensation occurred in the cooler
areas and attenuated the radar signal. Insulation was added around the
nozzle and over the mounting flange to keep the antenna and waveguide
free of condensation.
Engineers AJ Lambert and Jennifer Kessler are very satisfied with the
performance of the third crystallizer radar level transmitter and know the
operators are too. They keep it on the Rosemount 5600 radar for control all
the time.
The rough dimensions of tank and nozzle.
Comparison of the 5600 radar trend (yellow) with the Nuclear level trend (blue).
The trend of the nuclear device at the lower levels is thought to be incorrect due
to more deposits in the lower areas.
RESOURCES
Rosemount 5600
http://www.emersonprocess.com/rosemount/products/
level/m5600.html
Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc.
All other marks are the property of their respective owners.
Emerson Process Management
Rosemount Division
8200 Market Boulevard
Chanhassen, MN 55317 USA
T (U.S.) 1-800-999-9307
T (International) (952) 906-8888
F (952) 949-7001
www.rosemount.com
Emerson Process Management
Heath Place
Bognor Regis
West Sussex PO22 9SH,
England
T 44 1243 863121
F 44 1243 867554
For more information:
www.rosemount.com
00830-1100-4024, Rev BA
Emerson Process Management
Emerson Process Management Asia Pacific
Private Limited
1 Pandan Crescent
Singapore 128461
T (65) 6777 8211
F (65) 6777 0947
[email protected]